Which should be calculated first to solve this story problem?

hallie was making some bread for the bake sale. for each batch of bread she needed 2.5 cups wheat flour, 2.25 cups white flour, 0.25 cups sugar, and 2 tablespoons of yeast. she decided to make 2 batches of bread. how many cups of flour did hallie use altogether?

a.
the total number of cups of sugar in 2 batches of bread

b.
the total number of cups of flour in 1 batch of bread

c.
the total number of tablespoons of yeast needed